<!DOCTYPE html>
<html>
    <head>
        <meta http-equiv="content-type" content="text/html; charset=utf-8" />
        <title>learn d3.js</title>
        <script src="js/vendor.js" type="text/javascript" charset="utf-8"> </script>
        <script src="js/app.js" type="text/javascript" charset="utf-8"> </script>
        <link rel="stylesheet" href="css/app.css" />
    </head>
    <body>
        <div class="circles"></div>
        <div class="bars"></div>
        <div class="circles2"></div>
        <div class="bars2"></div>
    </body>
</html>
